PWM/PFM control circuit and switching power supply circuit

Details PWM/PFM control circuit and switching power supply circuit PWM/PFM control circuit and switching power supply circuit

2007-10-03

2009-08-25

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S284000

Reexamination Certificate

active

07579820

ABSTRACT:
A PWM/PFM control circuit has a differential time generating means for forming a differential time signal representing a differential time corresponding to a difference between the pulse width of a PWM control signal and the pulse width of a PFM control signal on condition that the pulse width of the PWM control signal is smaller than the pulse width of the PFM control signal, and the oscillation frequency of a reference signal serving as a reference for forming the PWM control signal is controlled based on the differential time signal to a low value in accordance with the differential time.

REFERENCES:
patent: 3241102 (1966-03-01), Peterson
patent: 6100675 (2000-08-01), Sudo
patent: 7061213 (2006-06-01), Yoshida
patent: 2008/0224674 (2008-09-01), Hasegawa
patent: 2009/0079408 (2009-03-01), Qiao et al.
patent: 2009/0079410 (2009-03-01), Ohkawa et al.
patent: 11155281 (1999-06-01), None

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